Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

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Hi,

On Tue, Nov 07, 2006 at 09:25:35AM +0100, Thomas Gleixner wrote:
> Andreas tested with the latest -mm1-hrt-dyntick patches, so he has all
> the checks already. The thing which worries me here is, that we detect
> the breakage and use the fallback path already, but it still has this
> weird effect on that system, while others just work fine. I'm cooking a
> more brute force fallback right now.

That's what I didn't understand all that time:
I do get the "C2 unusable, kills APIC timer" message, so I expected the code
to not use C2, but it seems it did use it (causing hangs) and I didn't
fully analyze the code whether it truly tried to prevent C2 here
(handling was a bit opaque to me, should have analyzed it
more thoroughly to get to know exactly what happens).

And like I said, brutally hard-wiring max_cstate to C1 already fixed
dynticks things for me, so it seems as if it still touched C2 before.

Andreas Mohr
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